The views of Windsor Castle painted by the brothers Thomas and Paul Sandby during the second half of the eighteenth century are some of the most exquisite and best loved British watercolours ever produced. Forty-seven of these from the British Royal Collection, arranged to form a complete topographical sequence, are illustrated here in colour and discussed together with the architectural history of the Castle, the oldest continuously occupied fortress in the western world. More than one hundred further illustrations, including photographs and maps, help to supplement the Sandbys' vivid record of life in the Castle during the eighteenth century and to trace the brothers' artistic development.